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US3612972A
Expired / Lapsed
US
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Adjusting drive
Assignee: Sulzer AG
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Filing: 1970-01-28
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Granted: 1971-10-12
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Expires: 1990-01-28
Abstract
Abstract The adjusting drive is controlled in dependence on the excess current of the motor and acts on either of the switching means in the conductor lines between the motor and current source to switch off the motor. A blocking arrangement is also used so as to prevent further movement of the motor after a shutdown which arrangement becomes unblocked upon reversing of the motor.
Inventors
- 👤 Ferdinand Konig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:39
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1418; H; H02; H02P; H02P23/00; H02P23/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
202 words
A positioning drive for moving an element to be positioned including: an asynchronous motor; a first switching means connected to said motor for permitting rotation of said motor in one direction; a second switching means connected to said motor for permitting rotation of said motor in an opposite direction; a switching circuit for actuating said first and second switching means, said switching circuit including an on-off switch for each direction of rotation; a current measuring device for measuring current supplied to said motor; and a switching device connected between said current measuring device and said first and second switching means, said switching device being responsive to a measurement of current in said current measuring device in excess of a predetermined value for opening said first or second switching means in dependence on the direction of rotation of said motor to switch off said motor, said switching device including blocking means responsive to a switching-off of said motor in dependence on the current measurement in said current measuring device for preventing subsequent switching-in of said motor in the same direction of rotation as previously, said blocking means being deactivated upon said switching device switching in said motor in the opposite dIrection of rotation.
Claim 2
Dependent Claim
202 words
A positioning drive for moving an element to be positioned including: an asynchronous motor; a first switching means connected to said motor for permitting rotation of said motor in one direction; a second switching means connected to said motor for permitting rotation of said motor in an opposite direction; a switching circuit for actuating said first and second switching means, said switching circuit including an on-off switch for each direction of rotation; a current measuring device for measuring current supplied to said motor; and a switching device connected between said current measuring device and said first and second switching means, said switching device being responsive to a measurement of current in said current measuring device in excess of a predetermined value for opening said first or second switching means in dependence on the direction of rotation of said motor to switch off said motor, said switching device including blocking means responsive to a switching-off of said motor in dependence on the current measurement in said current measuring device for preventing subsequent switching-in of said motor in the same direction of rotation as previously, said blocking means being deactivated upon said switching device switching in said motor in the opposite dIrection of rotation.
Claim 3
Dependent Claim
33 words
An adjusting drive as set forth in claim 1, further including means for increasing the current through said motor during startup above said predetermined value while simultaneously preventing actuation of said switching means.
Claim 4
Dependent Claim
31 words
An adjusting drive as set forth in claim 1 further including means for delaying a switching-on of said motor for a determined period of time after a switching-off of said motor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |